DECEMBER. 381 
the two latter grow under ground, and dogs are taught 
to hunt for them by the smell, which is powerful. When 
thoroughly made to understand the scent, they will scratch 
on the ground underneath which they grow, and thus 
bring their situation to light. The Mushroom may be dis- 
tinguished from the Toadstool by the lamelle, or divisions 
on the under side of the cap being pink when young, 
and becoming brown in an old state. There is an immense 
variety of Fungi, many very handsome in appearance, being 
crimson, bright orange, or the most delicate dove colour, and 
of all shades. A few have an exceedingly unpleasant smell, 
and may be discovered by this means in the woods where 
they grow. In form they differ much; many are very 
elegant, being like a miniature parasol; others much thicker 
and rounder at the top; some appearing to have no stalk,— 
a mere round ball. 
Auca. Sea-weeds. Plants growing under water, both 
fresh and salt, with the stem and leaves combined into lobed 
divisions,—some so fine as to resemble hair. 
A few of the plants of this order are found in fresh water, 
as the green slimy matter in pods. Ulva thermalis grows 
in hot springs also; but the Sea-weeds are much more in- 
teresting, and we will confine our attention to them. They 
